Hi.
On line 98 of signups.php there is an SQL statement that has a hardcoded "wp_" prefix on the rg_lead_meta table name. I made this change:
// oldline
// return $wpdb->get_var($wpdb->prepare("SELECT meta_value FROM wp_rg_lead_meta WHERE lead_id = %d AND meta_key = 'activation_key'", $lead_id));
// new line
return $wpdb->get_var($wpdb->prepare("SELECT meta_value FROM {$wpdb->prefix}rg_lead_meta WHERE lead_id = %d AND meta_key = 'activation_key'", $lead_id));
and it solved the problem I was having because the database I am currently working with uses an alternate table name prefix.
cheers, Martha